The complex compound in which metal is not present in zero oxidation state?

{M n}_{2} {(C O)}_{10}

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[N i {(C O)}_{4}]

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[C r {(C_{6} H_{6})}_{2}]

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K [{P t C l}_{3} (C_{2} H_{4})]

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Solution

The correct option is D $K [{P t C l}_{3} (C_{2} H_{4})]$
$A .$ $M n_{2} {(C O)}_{10} ⟹ 2 x + (10 \times 0) = 0 ⟹ x = 0,$ ( $x =$ oxidation state of metal.)
$B .$ $[N i {(C O)}_{4}] ⟹ x + (4 \times 0) = 0 ⟹ x = 0,$ ( $x =$ oxidation state of metal.)
$C .$ $[C r {(C_{6} H_{6})}_{2}] ⟹ x + (2 \times 0) = 0 ⟹ x = 0,$ ( $x =$ oxidation state of metal.)
$D .$ $K [P t C l_{3} (C_{2} H_{4})] ⟹ + 1 + x + 3 \times (- 1) + 0 = 0 ⟹ x = + 2,$ ( $x =$ oxidation state of metal.)
$∴$ $P t$ is in $+ 2$ Oxidation state.
$∴$ Option $D .$ is the correct answer.

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